E.g. in School we have 5-7 or 8 hours every day (Math, History, Biology, Chemistry, English etc.).
The first hour starts at 8:00 A.M.
But every Thursday we have an hour that stars at 7:10 A.M.
In the table it will look like this (just random picture from the web):
In Czech language we call it:
nultá hodina which is something like zero-ish hour
and then 1st, 2nd and 3rd: první, druhá, třetí hodina
How is nultá hodina (the hour that is before the first hour) called in English?
And how do you write it "shortly"? As 0th ? Or somehow else?